Qiu Yun, Yang Haibo, Cheng Yan, Bai Xiaoyu, Wen Bo, Lin Ying
Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Xi'an HeRong New Energy Technology Co. Ltd, Xi'an 710018, China.
Nanoscale. 2021 May 27;13(20):9204-9216. doi: 10.1039/d1nr01607e.
The rational design of nanostructures for absorbers has great potential in the microwave absorption field. In this work, a mixed ligand nickel metal-organic framework (ML-Ni MOF) was first prepared by the self-assembly of pyrazine and 1,3,5-benzenetricarboxylic acid with nickel ions. Then, the as-prepared ML-Ni MOF was used as a precursor to fabricate a nitrogen-doped carbon and nickel composite (ML-Ni/C). With the molar ratio of pyrazine and 1,3,5-benzenetricarboxylic acid of 1 : 1, the flower-like ML-Ni MOF was obtained. After pyrolysis, the ML-Ni MOF-derived ML-Ni/C composite showed an optimal reflection loss value of -65.33 dB with a thickness of 2.4 mm and a corresponding effective absorbing bandwidth (EAB, RL ≤ -10 dB) of 5.1 GHz. Besides, the broadest EAB of 7.6 GHz was achieved when the thickness was about 2.8 mm. This strategy paves a new way to design novel MOFs as precursors for fabricating absorbers.
用于吸收体的纳米结构的合理设计在微波吸收领域具有巨大潜力。在这项工作中，首先通过吡嗪和1,3,5-苯三甲酸与镍离子的自组装制备了一种混合配体镍金属有机框架（ML-Ni MOF）。然后，将制备好的ML-Ni MOF用作前驱体来制备氮掺杂碳与镍的复合材料（ML-Ni/C）。当吡嗪与1,3,5-苯三甲酸的摩尔比为1∶1时，获得了花状的ML-Ni MOF。热解后，由ML-Ni MOF衍生的ML-Ni/C复合材料在厚度为2.4 mm时显示出-65.33 dB的最佳反射损耗值，相应的有效吸收带宽（EAB，RL≤-10 dB）为5.1 GHz。此外，当厚度约为2.8 mm时，实现了7.6 GHz的最宽EAB。该策略为设计新型MOF作为制备吸收体的前驱体开辟了一条新途径。
